Finding it hard to give a shit.
On the one hand, I do believe that nobody but the artist(s) should be making money off of You Tube music "videos", though perhaps Google deserves a tiny bit to cover hosting costs.
On the other hand fuck the record industry (and IP owners in general) who think they are entitled to a near perpetual right to profit from work done once (and often, work done by someone else).
I would think there's some marketing value in the illicit You Tube versions of songs which really makes your entire argument somewhat moot. Nobody who can afford not to (or knows where to get the good stuff) is building their music collection by ripping YT videos.
Ultimately though, I view the entire internet as a hyper efficient library and don't feel much remorse about what I check out. I also occasionally go to movies and concerts and even purchase albums and books from time to time. No guilt here. If we are going to feel sorry for someone in the IP creation business, I'd worry more about the writers than anyone else. I think they are the most screwed in the long term. However, making sharing illegal is not and never will be a viable solution.